Conference paper

Publication year: 1993

Pages: C593-C602

Journal: Nuclear Physics A: Nuclear and Hadronic Physics

Volume number: 557

ISSN: 0375-9474

Conference: 21ST INTERNATIONAL SYMP ON RAPIDLY ROTATING NUCLEI

Publisher: Elsevier

Abstract: 
Nuclear Resonance Fluorescence experiments have been performed on spherical nuclei around neutron number N=82. Detailed information on energies, cross sections and absolute transition strengths (i.e. lifetimes) of dipole excitations between 1 and 4 MeV have been obtained for the nuclei Pr-141, Nd-142 and Nd-143. A very strongly excited 1--state in Nd-142 at 3.425 MeV is assigned as a member of the two-phonon 2+ x 3--multiplet. Calculations in the framework of the sdf-Interacting Boson Model for a similar state in the N=82 nucleus 144Sm confirm this assumption. In the neighbouring odd A nuclei Pr-141 and Nd-143 we found first evidence for the existence of two-phonon-particle-states which appear due to the coupling of the unpaired nucleon with the members of the 2+ x 3--multiplet in the core nucleus.

Harvard Citation style: VONBRENTANO, P., ZILGES, A., HEIL, R., HERZBERG, R., KNEISSL, U., PITZ, H., et al. (1993) LOW-ENERGY ELECTRIC-DIPOLE MODES IN NUCLEI AROUND N = 82, Nuclear Physics A: Nuclear and Hadronic Physics, 557, pp. C593-C602

APA Citation style: VONBRENTANO, P., ZILGES, A., HEIL, R., HERZBERG, R., KNEISSL, U., PITZ, H., & WESSELBORG, C. (1993). LOW-ENERGY ELECTRIC-DIPOLE MODES IN NUCLEI AROUND N = 82. Nuclear Physics A: Nuclear and Hadronic Physics. 557, C593-C602.